Bio 201 F11 Lect 10 (True) v2r

Bio 201 F11 Lect 10 (True) v2r -...

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Biology in the News [see folder on BB] the compe77ve strategy that woody vines use to complete with other plants is to grow quickly and outshade their compe7tors, such as trees kudzu ( Pueraria lobata ) is an invasive species in the US and elsewhere that rapidly climbs trees and other structures to complete for sunlight in the tropics, lianas (many different species in different phylogene7c groups of plants), are even more effec7ve than kudzu at this strategy their roots also strongly compete for water and minerals below ground in tropical forests, over a quarter of woody species have this growth form lianas are increasing in abundance in recent decades, at the cost of trees and other forest plants e.g. tree crown infesta7ons of lianas increased from 32% in 1967‐1968 to 75% in 2007 in Barro Colorado Island, Panama some liana species are also invasive in non‐tropical areas of North America if these increases con7nue, biologists may eventually worry about preserving many tree species in the tropics hUp://www.nsf.gov/news/news_summ.jsp? cntn_id=119057&WT.mc_id=USNSF_51&WT.mc_ev= click
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1 st mid term exam Wed. September 28 th in class covers material through Friday 9/23 lecture (first 10 lectures) prac7ce ques7ons will be posted; review sessions listed on next slide Be on 7me >10 min late will not be allowed into room Bring only your ID and pencils All other materials have to be lee on periphery of the room 35 mul7ple choice ques7ons + 3 bonus bio news ques7ons lowest of the three mid terms is dropped, avg. of other 2 = 60% of your grade Only documented medical/family/accident excuses accepted we need to be NOTIFIED before end of the day on the day of the exam
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Exam 1 Review Sessions held in Life Sciences 026 Friday 9/23 ‐ 3:00 ‐ 4:00 ‐ Alvin Ho Monday 9/26 ‐ 2:00 ‐ 3:00 ‐ Safa Abdelhakim Monday 9/26 ‐ 4:00 ‐ 5:00 ‐ Harrison Dai Tuesday 9/27 ‐ 8:30 AM ‐ 9:30 AM ‐ Redwan Ahmed Tuesday 9/27 ‐ 10:30 ‐ 11:30 AM ‐ Dana Opulente Tuesday 9/27 ‐ 2:00 ‐ 3:00 ‐ Dana Opulente BRING YOUR QUESTIONS; TA’s do not make presenta7ons
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more on phylogene7c trees one major set of tree‐building methods is based on the concept of parsimony – the hypothesis that involves the fewest evolu7onary events is thought to be the most likely adjec7ve: parsimonious parsimony is essen7ally the concept of Occam’s razor – given compe7ng hypotheses to explain a phenomenon, the hypothesis involving the fewest assump7ons is considered the most likely
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an example of the use of parsimony hUp://www.geology.wisc.edu/~museum/ hughes/images/parsimony.jpg
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